Solidification behavior during directed light fabrication
- Los Alamos National Lab., NM (United States). Materials Science and Technology Div.
Directed light fabrication (DLF) is a process that fuses gas delivered metal powders within a focal zone of a laser beam to produce fully dense, 3-dimensional metal components. A variety of materials have been processed with DLF, ranging from steels to tungsten, and including intermetallics such as NiAl and MoSi{sub 2}. To evaluate the processing parameters and resulting microstructures, solidification studies have been performed on defined alloy systems. For example, solidification cooling rates have been determined based upon secondary dendrite arm spacings in Fe-based alloys. In addition, eutectic spacings have been used to define growth velocities during solidification. Cooling rates vary from 10{sup 1}-10{sup 5} K s{sup {minus}1} and growth rates vary between 1--50 mm s{sup {minus}1}. As a result, process definition has been developed based upon the microstructural development during solidification. The materials explored were Ag-19Cu, Fe-24.8Ni, 316 stainless steel, Al-33Cu, W, MoSi{sub 2} and NiAl.
- Research Organization:
- Los Alamos National Lab., NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 119969
- Report Number(s):
- LA-UR--95-3332; CONF-951026--5; ON: DE96001379
- Country of Publication:
- United States
- Language:
- English
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